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W. W. C. G. MECLAY.

NUT LUCK.

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UNITED STATES PATENT ovinos.

WILLIAM W- @CLAY een sneeeedesssm lewe?, F Cruces@ ILHILSOIS; SAID [gingen W. MCGLAY Assignee To serp QLennncE einem. MecLAY.

p NUT-Loox.

Specication of Letters Patent.

Patenten nee. '1o. 191s.

Application led May 31, 1918. Serial No. 23',532.

To all whom it may concern:

Be it known that We, W'ILLIeM W. Mo-

' CLAY and CLARENCE G. MCCLAY, citizens of specification.V

the United States, residing at Chicago, Vin the county of Cook and State of Iliinois, have invented new and useful Improvements in NutLocks, of Which the following is a A bolt so that the nut cannot back off the same.

The invention relates more particularly to the means whereby the locking member is lockedV to the bolt, the saine comprisinga novel and improved structure to he herein after described and claimed.

1n order that the invention may he Vknetter understood, reference is had to the accompenying Vdrawing forming a partV 'of this specification', and in said drawing,

Eignre'l is an elevation Voi? the device showing the position thereof before it is in locking position; Y

Fig. 2 is an elevation showing the device in lockingposition; i Y

Fig. 3 is a cross section on the line 3 3 ofFig.2;" 'i

Fi 4 is an inverted plan View of a modified germ of locking device;

Fig. 5 is a cross section of said device showing the manner in which it is started on the bolt;

Fig. 6 is an end view of the bolt;

Fig. 7 is a view similar to Fig. 5, showing the device in locking position, and

Fig. 8 is a perspective view of the device in final locking position.

Referring specificalb7 to the drawing, 5 denotes the shank of a holt which is threaded to receive an ordinary nut 6. The locking device is a flat Washer-like body 7 having a threaded central opening so that it may oe screwed on the bolt, and said body is provided with two dialnetrically opposite locking tongues 8 arranged and cooperating with the bolt in a manner to prevent roationof the deviceon the holt after it is placed in proper position thereon. The tongues extend straight ont freni the body T and have theirV outer ends formed with inwardly bowed portions 9 located above the body in spaced relation with the outer surface thereof andfextending transversely of the holt T he length of the bowed extremities of. the tongues is such that they terminate close to the sdesof the holt, and upon straightening said hwzvvedY portions, they lengthen, thereby bringing their extremities closer to the bolt. Opposite the extremities of the parts 9, the bolt is formed with a transverse groove 10, leaving the bolt with a reduced neck 11 which is angular in cross-section- The length of the bolt will he such that 'Ehen the nut 6 is screwed thereon. enough ofthe bolt is left projecting from the outer face of the nut to receive the locking membei' T, the latter being screwed on the proiecting end of the bolt untilit Vseats tightly against the outer face of the nut. The tongues 9 are now Vopposite, the groove 10. and upon straightening them by blows with a hammer or other tool, they.7 can he advanced into the groove until their extremiries abut against the flat sides of the neck 11, the latter non' preventing the device from turning oli' the holt, and the groove preventing longitudinal movement of the device on the bolt. The device is therefore securely locked on the holt, and as it; is hack of the nut 6, the latter cannot come od, the holt. If the nut is to be. taken off the holt, it is necessary only toV inserta Vsnitalole tool under theefprts 9 and pry them out of the groove 10, which leaves the device free to be screwed oil' the bolt. The parts 9 are suf ficiently flexible so that they may be bent in the manner stated.

It will be seen from the foregoing that the device is very simple and inexpensive. and it can be easily applied. No change is made in the structure of the not, and the bolt is not modified except that it is formed with the groove 10 and the neck 11.

Figs. 4 to 8 illustrate another embodiment of the invention. Here7 the locking device is a heavy malleable Washer plate 12 having a rectangular opening 13, at opposite sides of which are inturned tongues 14, which latter are integral with the plate, being formed by slitting the same at opposite ends of the opening. The tongues have bottom bevels 15 at their extremities for a purpose to be presently described.

At 16 is shown a fragment of the bolt on which a nut 17 is screwed. The outer end ot' this bolt is reduced and squared as shown at 18. At the inner end of this reduced portion of the bolt, it is formed, on opposite sides, .With a transverse groove 19, leaving the bolt shank here With a reduced neck 20 which is angular in cross section. The cross-sectional area of the portion 18 of the bolt shank is such that it may pass through the opening 13 of the Washer plate 12.

The tongues 14 are bent or bowed downward from the washer plate 12, and they are in this position before applying the plate to the bolt 16 to lock the nut 17 thereon. The grooves 19 are so positioned on the bolt that they come flush with the outer surface of the nut 17 when the latter is screwed home.

In use, the plate 1Q is slid along the part 18 of the bolt 16 until the extremities of the tongues 14 are opposite the grooves 19. Blows by a hammer or other suitable impacting tool, against the plate, on each side thereof, bends the tongues upward, and upon straightening out they advance into the grooves 19, the beveled portions 15 assisting the tongues in sliding into the grooves. The plate is also driven to seat on the outer face of the nut 17, and the latter is now prevented from turning off the bolt, the grooves 19 producing a shoulder preventing longitudinal movement of the plate 12 on the bolt as before.

To release the nut 17, the plate 12 can be readily removed by prying the tongues 1+ out of the grooves 19.

It will be noted that the nut 17 is beveled at its outer corners, as shown at 21. This allows the plate 12 to be forced over the corners to further prevent the nut from turning back and forth, and wearing the thread loose from continued jar.

toward the groove, and oi such length that when straightened the)v enter the groove and engage the flat sides of the aforesaid neck portion of the bolt and the shoulder. whereby the locking member is held against longitudinal and turning movement on the bolt.

2. The combination with a bolt having a transverse groove adjacent to its outer end. the grooved portion of the bolt being a reduced neck portion having flat sides and producing a shoulder on the bolt; of a locking member mounted on the bolt and having a projecting tongue pointing toward the groove, and of such length that when straightened out it enters the groove and engages the flat side of th(` neck portion of the bolt and the shoulder, whereby the lockingr member is held against longitudinal and turning movement on the bolt.

3. The combination with a bolt and a nut thereon. the bolt having a transverse groove adjacent to its outer end, the grooved portion of the bolt being a reduced neck portion having flat sides and producing a shoulder on the bolt; of a locking member mounted on the bolt and having a projecting tongue pointing toward the groove, and of such length that when straightened out it enters the groove and engages the flat side of the neck portion of the bolt and the shoulder, Wherebjr the locking member is held against longitudinal and turning movement on the bolt, and cooperating means on the nut and the locking member t'or locking said member to the nut.

In testimony .whereof we aiiix our signatures.

WILLIAM W. MUCLAY. CLARENCE GILBERT MCCLAY.

Copies ot this patent muy be obtained for ive cents each, by addressing the "Commissioner of Potents, Washington, D. G." 

